Managing snapshots and application state in micro-batch based event processing systems

1. A method for managing snapshots created from a Continuous Query Language (CQL) engine, comprising: receiving, by a computing device, a continuous query; applying, by the computing device, a Directed Acrylic Graph (DAG) transformation to the continuous query to generate a query plan for the continuous query, wherein the query plan is an ordered set of steps used to access data for processing of the continuous query; applying, by the computing device, a CQL transformation to the query plan to generate a transformed query plan; receiving, by a computing device, a micro-batch stream of input events related to an application; processing, by the computing device, the input events using the CQL engine to generate a set of output events related to the application, wherein the processing comprises: performing, by the CQL engine, incremental computation on each of the input events of the micro-batch stream for the continuous query based at least in part on the transformed query plan; and creating, by the CQL engine, output events for each of the input events of the micro-batch stream, wherein the set of output events comprise the output events for each of the input events of the micro-batch stream; generating, by the computing device and using a snapshot management algorithm implemented by the CQL engine, a snapshot of a current state of a system based at least in part on the set of output events related to the application; generating, by the computing device, a first directory structure to access snapshot information associated with the snapshot of the current state of the system; generating, by the computing device, a second directory structure to generate a list of snapshots associated with the current state of the system; and determining, by the computing device, based at least in part on the snapshot management algorithm, a process to get, add, or clean the list of snapshots associated with the current state of the system.

2. The method of claim 1 , wherein the micro-batch stream is a continuous stream of data discretize into sub-second micro-batches.

3. The method of claim 1 , further comprising storing, by the computing device, the set of output events related to the application in an output queue; and transmitting, by the computing device, the output events in the output queue when all of the input events have been processed.

4. The method of claim 3 , wherein the micro-batch stream comprises micro-batches of data or Resilient Distributed Datasets (RDDs).

5. The method of claim 4 , wherein the processing each of the input events comprises performing a computation on each of the input based at least in part on the transformed query plan.

6. The method of claim 5 , wherein the continuous query includes pattern matching.

7. A system, comprising: a memory configured to store computer-executable instructions; and a processor configured to access the memory and execute the computer-executable instructions to: receive a continuous query; apply a Directed Acrylic Graph (DAG) transformation to the continuous query to generate a query plan for the continuous query, wherein the query plan is an ordered set of steps used to access data for processing of the continuous query; apply a Continuous Query Language (CQL) transformation to the query plan to generate a transformed query plan such that a CQL engine can execute the continuous query using the transformed query plan; receive a micro-batch stream of input events related to an application; process the input events using the CQL engine to generate a set of output events related to the application, wherein the processing comprises: performing, by the CQL engine, incremental computation on each of the input events of the micro-batch stream for the continuous query based at least in part on the transformed query plan; and creating, by the CQL engine, output events for each of the input events of the micro-batch stream, wherein the set of output events comprise the output events for each of the input events of the micro-batch stream; generate, using a snapshot management algorithm implemented by the CQL engine, a snapshot of a current state of a system based at least in part on the set of output events related to the application; generate a first directory structure to access snapshot information associated with the snapshot of the current state of the system; generate a second directory structure to generate a list of snapshots associated with the current state of the system; and determine based at least in part on the snapshot management algorithm, a process to get, add, or clean the list of snapshots associated with the current state of the system.

8. The system of claim 7 , wherein the micro-batch stream is a continuous stream of data discretize into sub-second micro-batches.

9. The system of claim 7 , wherein the computer executable instructions are further executable to store the set of output events related to the application in an output queue; and transmit the output events in the output queue when all of the input events have been processed.

10. The system of claim 9 , wherein the micro-batch stream comprises micro-batches of data or Resilient Distributed Datasets (RDDs).

11. The system of claim 10 , wherein the processing each of the input events comprises performing a computation on each of the input based at least in part on the transformed query plan.

12. The system of claim 11 , wherein wherein the continuous query includes pattern matching.

13. A computer-readable medium storing computer-executable code that, when executed by a processor, cause the processor to perform operations comprising: receiving a continuous query; applying a Directed Acrylic Graph (DAG) transformation to the continuous query to generate a query plan for the continuous query, wherein the query plan is an ordered set of steps used to access data for processing of the continuous query; applying a Continuous Query Language (CQL) transformation to the query plan to generate a transformed query plan such that a CQL engine can execute the continuous query using the transformed query plan; receiving a micro-batch stream of input events related to an application; processing the input events based at least in part on the transformed query plan using the CQL engine to generate a set of output events related to the application, wherein the processing comprises: performing, by the CQL engine, incremental computation on each of the input events of the micro-batch stream for the continuous query based at least in part on the transformed query plan; and creating, by the CQL engine, output events for each of the input events of the micro-batch stream, wherein the set of output events comprise the output events for each of the input events of the micro-batch stream; generating, using a snapshot management algorithm implemented by the CQL engine, a snapshot of a current state of a system based at least in part on the set of output events related to the application; generating a first directory structure to access snapshot information associated with the snapshot of the current state of the system; generating a second directory structure to generate a list of snapshots associated with the current state of the system; and determining based at least in part on the snapshot management algorithm, a process to get, add, or clean the list of snapshots associated with the current state of the system.

14. The computer-readable medium of claim 13 , wherein the micro-batch stream is a continuous stream of data discretize into sub-second micro-batches.

15. The computer-readable medium of claim 13 , wherein operations further comprise storing the set of output events related to the application in an output queue; and transmitting the output events in the output queue when all of the input events have been processed.

16. The computer-readable medium of claim 15 , wherein the micro-batch stream comprises micro-batches of data or Resilient Distributed Datasets (RDDs).

17. The computer-readable medium of claim 16 , wherein the processing each of the input events comprises performing a computation on each of the input based at least in part on the transformed query plan.